[Arran]

I don't think that there was any difference in quality between the cabinet for a Canadian built 37-3116X and a Philadelphia built 37-3116X, the added marquetry was probably the prerogative of whoever built the cabinet. Then again maybe they had a lot of short pieces of veneer on hand that they wanted to use up? As far as I know Philco Products of Canada didn't offer different grades of cabinet, at least not with that model, but there may have been variants between production runs depending on who built the cabinets. Like I mentioned my uncle used to have a 345L, where the cabinet was built by McLagan Furniture, but I have also seen Canadian Philco cabinets built by Thomas, and others with no maker noted.
There have been plenty of varients in U.S built cabinets as well, like in the grain direction on a Philco 70 cabinet, sometimes in the species of veneer used. You see a lot of cabinet variants on Canadian Westinghouse sets, like the model 780X for example, which was the set featured in "A Christmas Story", some have inlay on the top and control panel, others have stump walnut veneer and no inlay, and the number of grill bars differs between the two types as well. I don't know if Philco of Canada had their own cabinet shop like Philco of U.S.A did, I think maybe they did but farmed out production on some models or runs. Ron has the Philco furniture book which states who made what, some were made in house, others were framed out to outfits like Red Lion (whom also made cabinets for Atwater Kent).
Regards
Arran